# 调试

# def deb(x,y,debug):
#     if debug:
#         print(f'x = {x},y = {y}')
#     return x+y
#
#
# res = deb(10,20,False)    # 不美观
# print(res)


# def deb(x = 10,y = 20,debug = True):
#     if debug:
#         print(f'x = {x},y = {y}')
#     return x+y
#
#
# res = deb(10,20)
# print(res)


def deb(x = 10,y = 20,debug = True):
    if debug:
        print(f'x = {x},y = {y}')
    return x+y


res = deb()
print(res)